碳点的结构与发光起源

Structure and Photoluminescence Origin of Carbon Dots

作为环境友好、性能优异的发光纳米材料,碳点在光电器件、生物诊疗及能源催化等前沿领域均表现出良好的应用潜力,近年来备受关注.由于原料和合成方法的巨大差异,碳点通常具有复杂的光学性质.以本课题组的前期研究工作为基础,结合对粒子生长过程分析,本文介绍了碳点的主要发光机理,包括共轭π域的碳核态、表面-边缘态、类有机荧光团的分子态和交联增强发射效应,综合评述了碳点领域关于粒子结构与发光起源的争议性问题,并展望了未来的发展趋势.

As environmentally friendly and high-performance nanomaterials,carbon dots(CDs)have shown good application potential in many cutting-edge fields,e.g.optoelectronic devices,biological diagnosis and treatment,and energy catalysis,which has attracted much attention in recent years.Due to the significant differences in raw materials and synthesis methods,CDs always show complex optical properties.Based on the previous research work of our research group and the analysis of the particle growth process,this article introduces the main photolumines-cence(PL)mechanisms of CDs,including the carbon core state of conjugatedπ-domain,surface-edge state,organic fluorophores-like molecular state,and crosslink enhanced emission effect.This paper comprehensively reviewed controversial scientific issues on particle structure and PL origin in the field of CDs,and prospected the future trends.